condition mean min max ZT0-3 35.599698 35.599698 35.599698 ZT4-7 59.1417445 59.1417445 59.1417445 ZT8-11 66.029934 66.029934 66.029934 ZT12-15 90.57172 90.57172 90.57172 ZT16-19 60.115311500000004 60.115311500000004 60.115311500000004 ZT20-23 40.0018455 40.0018455 40.0018455