condition mean min max ZT0-3 34.8032642 29.13424119 40.472287210000005 ZT4-7 40.207948645 38.351976655 42.063920635 ZT8-11 46.636491095 43.96640747 49.30657472 ZT12-15 55.98259419 54.524469984999996 57.440718395 ZT16-19 57.766150887500004 55.746871905 59.78542987 ZT20-23 68.3983115375 65.18300814 71.613614935