condition mean min max ZT0-3 2.4640874999999998 1.8680050000000001 3.06017 ZT4-7 4.911955 4.911955 4.911955 ZT8-11 5.787265 5.787265 5.787265 ZT12-15 0 0 0 ZT16-19 11.45275 11.45275 11.45275 ZT20-23 7.782185 7.782185 7.782185