condition mean min max ZT0-3 26.263740255 14.4438521 38.083628409999996 ZT4-7 129.37300951 117.84450827 140.90151075 ZT8-11 221.90271135 186.55570465 257.24971805 ZT12-15 268.39829692499995 260.29343689999996 276.50315695 ZT16-19 135.437890585 110.53829582 160.33748535 ZT20-23 53.7991828525 37.435210615 70.16315509