condition mean min max ZT0-3 30.9996 30.9996 30.9996 ZT4-7 37.450458 37.450458 37.450458 ZT8-11 39.252185499999996 39.252185499999996 39.252185499999996 ZT12-15 31.3335065 31.3335065 31.3335065 ZT16-19 32.822030500000004 32.822030500000004 32.822030500000004 ZT20-23 38.349204 38.349204 38.349204