condition mean min max ZT0-3 37.97435 25.53745 45.74795 ZT4-7 27.060000000000002 27.060000000000002 27.060000000000002 ZT8-11 30.63785 30.63785 30.63785 ZT12-15 36.400775 32.00645 40.795100000000005 ZT16-19 31.86695 31.86695 31.86695 ZT20-23 39.11195 39.11195 39.11195