condition mean min max ZT0-3 25.706745095000002 21.43756718 29.975923010000002 ZT4-7 16.921162357 13.579773879000001 20.262550835 ZT8-11 6.62639080025 6.139372075500001 7.113409525000001 ZT12-15 34.419591288 27.269937031 41.569245545 ZT16-19 37.203875315 34.603836945 39.803913685 ZT20-23 38.125996547499994 37.64026225 38.611730845