condition mean min max ZT0-3 4.21881 4.21881 4.21881 ZT4-7 4.17532 4.17532 4.17532 ZT8-11 4.18528 4.18528 4.18528 ZT12-15 4.10943 4.10943 4.10943 ZT16-19 4.15816 4.15816 4.15816 ZT20-23 4.15257 4.15257 4.15257