condition mean min max ZT0-3 10.181723333333334 10.181723333333334 10.181723333333334 ZT4-7 7.70436 7.70436 7.70436 ZT8-11 4.104945 4.104945 4.104945 ZT12-15 3.377275 3.377275 3.377275 ZT16-19 4.609360000000001 4.609360000000001 4.609360000000001 ZT20-23 7.48453 7.48453 7.48453