condition mean min max ZT0-3 10.012074166666666 10.012074166666666 10.012074166666666 ZT4-7 10.557604999999999 10.557604999999999 10.557604999999999 ZT8-11 9.4789725 9.4789725 9.4789725 ZT12-15 10.402575 10.402575 10.402575 ZT16-19 6.2178975 6.2178975 6.2178975 ZT20-23 7.426425 7.426425 7.426425