condition mean min max ZT0-3 113.495357 113.495357 113.495357 ZT4-7 66.4593745 66.4593745 66.4593745 ZT8-11 54.700722999999996 54.700722999999996 54.700722999999996 ZT12-15 49.4849785 49.4849785 49.4849785 ZT16-19 40.104174 40.104174 40.104174 ZT20-23 43.53864 43.53864 43.53864