为什么我在年龄上得到错误的整数值错误？我正在使用正确的数据类型和值吗？

Question

insert into  `patient` ( `pat_f_name`, `pat_l_name`, `pat_gender`, `pat_age`, `pat_dob`, `pat_blood_grp`, `pat_weight`, `pat_contact_no`, `pat_address` )
    ->  VALUES
    ->  ('$user_fname','$user_lname','$user_gender','$user_age','$user_dob','$user_bg','$user_weight','$user_contact_no','$user_address');

  

ERROR 1366（HY000）：不正确的整数值：＆＃39; $ user_age＆＃39;对于专栏＆＃39; pat_age＆＃39;在第1行

表格看起来像

+----------------+-------------+------+-----+---------+----------------+
| Field          | Type        | Null | Key | Default | Extra          |
+----------------+-------------+------+-----+---------+----------------+
| pat_id         | int(50)     | NO   | PRI | NULL    | auto_increment |
| dr_id          | int(50)     | NO   |     | NULL    |                |
| pat_f_name     | char(20)    | NO   |     | NULL    |                |
| pat_l_name     | char(20)    | NO   |     | NULL    |                |
| pat_gender     | char(20)    | NO   |     | NULL    |                |
| pat_age        | int(20)     | NO   |     | NULL    |                |
| pat_dob        | date        | NO   |     | NULL    |                |
| pat_blood_grp  | varchar(10) | NO   |     | NULL    |                |
| pat_weight     | int(10)     | NO   |     | NULL    |                |
| pat_contact_no | varchar(12) | NO   |     | NULL    |                |
| pat_address    | varchar(20) | NO   |     | NULL    |                |
+----------------+-------------+------+-----+---------+----------------+

Answer 1

$sql = "INSERT INTO patient(pat_f_name, pat_l_name, pat_gender, pat_age, pat_dob, pat_blood_grp, pat_weight, pat_contact_no, pat_address) VALUES ('$user_fname','$user_lname','$user_gender','$user_age','$user_dob','$user_bg','$user_weight','$user_contact_no','$user_address')";