condition mean min max ZT0-3 19.43405032575 13.267588611499999 25.60051204 ZT4-7 7.03842538625 6.735492493000001 7.3413582795 ZT8-11 23.4888898505 12.611058951 34.36672075 ZT12-15 26.7394699175 20.793639745 32.68530009 ZT16-19 13.4652202045 12.006459434 14.923980975000001 ZT20-23 8.01261555325 7.257749091999999 8.7674820145