condition mean min max ZT0-3 22.517961 22.517961 22.517961 ZT4-7 26.6992945 26.6992945 26.6992945 ZT8-11 29.711019999999998 29.711019999999998 29.711019999999998 ZT12-15 29.223343999999997 29.223343999999997 29.223343999999997 ZT16-19 52.542378 52.542378 52.542378 ZT20-23 58.2699705 58.2699705 58.2699705