condition mean min max ZT0-3 8.654587734 4.175138243999999 13.134037224 ZT4-7 40.77416859 33.5661074 47.98222978 ZT8-11 66.71332329 64.53391116499999 68.892735415 ZT12-15 53.29084557 49.66930354 56.9123876 ZT16-19 43.830390439999995 41.625832759999994 46.034948119999996 ZT20-23 71.53752575 55.935373854999995 87.139677645