condition mean min max ZT0-3 8.358661666666666 6.839675 9.774915 ZT4-7 8.84467 8.84467 8.84467 ZT8-11 9.869235 9.869235 9.869235 ZT12-15 14.6771 14.3172 15.037 ZT16-19 10.172905 10.172905 10.172905 ZT20-23 9.388770000000001 9.388770000000001 9.388770000000001