condition mean min max ZT0-3 0.77259 0.77259 0.77259 ZT4-7 0.5882815 0.5882815 0.5882815 ZT8-11 0.2996645 0.2996645 0.2996645 ZT12-15 0.15674749999999998 0.15674749999999998 0.15674749999999998 ZT16-19 0.283278 0.283278 0.283278 ZT20-23 0.682887 0.682887 0.682887