condition mean min max ZT0-3 4.3553725 3.3794649999999997 5.33128 ZT4-7 4.3824 4.3824 4.3824 ZT8-11 3.54849 3.54849 3.54849 ZT12-15 0 0 0 ZT16-19 8.909479999999999 8.909479999999999 8.909479999999999 ZT20-23 10.237345000000001 10.237345000000001 10.237345000000001