condition mean min max ZT0-3 53.557787 53.557787 53.557787 ZT4-7 35.366923 35.366923 35.366923 ZT8-11 31.262869000000002 31.262869000000002 31.262869000000002 ZT12-15 37.1301745 37.1301745 37.1301745 ZT16-19 28.3140775 28.3140775 28.3140775 ZT20-23 23.646411999999998 23.646411999999998 23.646411999999998