condition mean min max ZT0-3 1.607915 1.607915 1.607915 ZT4-7 0.9952265 0.9952265 0.9952265 ZT8-11 1.27346 1.27346 1.27346 ZT12-15 2.12286 2.12286 2.12286 ZT16-19 2.836525 2.836525 2.836525 ZT20-23 2.20571 2.20571 2.20571