condition mean min max ZT0-3 15.50475 15.50475 15.50475 ZT4-7 13.62585 13.62585 13.62585 ZT8-11 9.191035 9.191035 9.191035 ZT12-15 13.819749999999999 13.819749999999999 13.819749999999999 ZT16-19 15.47275 15.47275 15.47275 ZT20-23 14.180900000000001 14.180900000000001 14.180900000000001