condition mean min max ZT0-3 13.929574999999998 11.4089 16.450249999999997 ZT4-7 6.108029999999999 6.108029999999999 6.108029999999999 ZT8-11 7.00021 7.00021 7.00021 ZT12-15 0 0 0 ZT16-19 14.9267 14.9267 14.9267 ZT20-23 13.882200000000001 13.882200000000001 13.882200000000001