condition mean min max ZT0-3 3.1322725 1.79699 4.467555 ZT4-7 1.8060100000000001 1.8060100000000001 1.8060100000000001 ZT8-11 4.18328 4.18328 4.18328 ZT12-15 0 0 0 ZT16-19 5.47836 5.47836 5.47836 ZT20-23 4.83133 4.83133 4.83133